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Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate

INTRODUCTION: The aim of this in vitro study was to evaluate the effect of smear layer on the push-out bond strength of white mineral trioxide aggregate (WMTA) with and without disodium hydrogen phosphate (Na(2)HPO(4)). MATERIALS AND METHODS: Dentin discs with standard cavities were obtained from ex...

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Autores principales: Lotfi, Mehrdad, Rahimi, Saeed, Ghasemi, Negin, Vosoughhosseini, Sepideh, Bahari, Mahmood, Saghiri, Mohammad Ali, Shahidi, Atabak
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Iranian Center for Endodontic Research 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3808673/
https://www.ncbi.nlm.nih.gov/pubmed/24171021
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author Lotfi, Mehrdad
Rahimi, Saeed
Ghasemi, Negin
Vosoughhosseini, Sepideh
Bahari, Mahmood
Saghiri, Mohammad Ali
Shahidi, Atabak
author_facet Lotfi, Mehrdad
Rahimi, Saeed
Ghasemi, Negin
Vosoughhosseini, Sepideh
Bahari, Mahmood
Saghiri, Mohammad Ali
Shahidi, Atabak
author_sort Lotfi, Mehrdad
collection PubMed
description INTRODUCTION: The aim of this in vitro study was to evaluate the effect of smear layer on the push-out bond strength of white mineral trioxide aggregate (WMTA) with and without disodium hydrogen phosphate (Na(2)HPO(4)). MATERIALS AND METHODS: Dentin discs with standard cavities were obtained from extracted human single-rooted teeth and divided to 4 groups (n=15) according to the irrigation regimen and the canal filling material. In groups 1 and 3, canals were irrigated with normal saline; in groups 2 and 4, irrigation method included sodium hypochlorite (NaOCl) and then ethylenediaminetetra-acetic acid (EDTA). The canals were filled with WMTA in first and second groups and with WMTA+Na(2)HPO(4); in groups 3 and 4. The samples were wrapped in wet gauze and incubated in 37°C for 3 days. The push-out bond strength was then measured by means of the Universal Testing Machine and the failure modes were examined under stereomicroscope at 40× magnification. Tow-way ANOVA was used to evaluate the effect of material type and smear layer removal. Post hoc Tukey test was used for the two-by-two comparison of the groups. RESULTS: The greatest and lowest mean±standard deviation for push-out bond strength were observed in groups 4 (4.54±1.14 MPa) and 1 (1.44±0.96 MPa), respectively. The effect of removing the smear layer on the push-out bond strength of WMTA+Na(2)HPO(4) was significant (P=0.01), but not for WMTA (P=0.52). Interestingly, there was significant difference between groups 1, 3 and 2, 4 (P<0.05). The failure mode for all experimental groups was of mixed type. CONCLUSION: Under circumstances of this in vitro study, removal of smear layer increases push-out bond strength when Na(2)HPO(4) is added to WMTA.
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spelling pubmed-38086732013-10-29 Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate Lotfi, Mehrdad Rahimi, Saeed Ghasemi, Negin Vosoughhosseini, Sepideh Bahari, Mahmood Saghiri, Mohammad Ali Shahidi, Atabak Iran Endod J Original Article INTRODUCTION: The aim of this in vitro study was to evaluate the effect of smear layer on the push-out bond strength of white mineral trioxide aggregate (WMTA) with and without disodium hydrogen phosphate (Na(2)HPO(4)). MATERIALS AND METHODS: Dentin discs with standard cavities were obtained from extracted human single-rooted teeth and divided to 4 groups (n=15) according to the irrigation regimen and the canal filling material. In groups 1 and 3, canals were irrigated with normal saline; in groups 2 and 4, irrigation method included sodium hypochlorite (NaOCl) and then ethylenediaminetetra-acetic acid (EDTA). The canals were filled with WMTA in first and second groups and with WMTA+Na(2)HPO(4); in groups 3 and 4. The samples were wrapped in wet gauze and incubated in 37°C for 3 days. The push-out bond strength was then measured by means of the Universal Testing Machine and the failure modes were examined under stereomicroscope at 40× magnification. Tow-way ANOVA was used to evaluate the effect of material type and smear layer removal. Post hoc Tukey test was used for the two-by-two comparison of the groups. RESULTS: The greatest and lowest mean±standard deviation for push-out bond strength were observed in groups 4 (4.54±1.14 MPa) and 1 (1.44±0.96 MPa), respectively. The effect of removing the smear layer on the push-out bond strength of WMTA+Na(2)HPO(4) was significant (P=0.01), but not for WMTA (P=0.52). Interestingly, there was significant difference between groups 1, 3 and 2, 4 (P<0.05). The failure mode for all experimental groups was of mixed type. CONCLUSION: Under circumstances of this in vitro study, removal of smear layer increases push-out bond strength when Na(2)HPO(4) is added to WMTA. Iranian Center for Endodontic Research 2013-10-07 2013 /pmc/articles/PMC3808673/ /pubmed/24171021 Text en Copyright © 2013, Iranian Endodontic Journal. http://creativecommons.org/licenses/by/3/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Lotfi, Mehrdad
Rahimi, Saeed
Ghasemi, Negin
Vosoughhosseini, Sepideh
Bahari, Mahmood
Saghiri, Mohammad Ali
Shahidi, Atabak
Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate
title Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate
title_full Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate
title_fullStr Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate
title_full_unstemmed Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate
title_short Effect of Smear Layer on the Push-Out Bond Strength of Two Different Compositions of White Mineral Trioxide Aggregate
title_sort effect of smear layer on the push-out bond strength of two different compositions of white mineral trioxide aggregate
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3808673/
https://www.ncbi.nlm.nih.gov/pubmed/24171021
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